After fitting a new CPU and interconnect board, flasher circuits with one bulb work, but circuits with two flashers only glimmer one bulb, and incandescent bulbs do not light at all.
Double flasher circuits barely light: new interconnect board has 5.6K resistors
Cause: The new interconnect board was built with 5.6K ohm resistors (R3, R4, R5, R7, R8) where the original board has 5.6 ohm ones. System 11 interconnect boards use game-specific resistor values for the flasher circuits.
Checks
- Compare each flasher resistor on the new board with the original; an autoranging meter can hide the difference between ohms and kilohms, so read the units carefully.
- Make sure the replacement interconnect board is the one for this game.
Fix
- Refit the original interconnect board, or replace the wrong resistors with the correct 5.6 ohm values.
Systems
Games
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Source: Pinball Repair help group!! (Facebook group)